Yes your concept is fully functional, implementation as well.
But I look for something more radical.
As we know music is recorded in digital formats files fro 1978 - https://musicproductionknowledge.com/software/digital-audio-workstation/daw-history and massively from 1980.
Therefore source of all music that we today listen is mainly from some file. That say all analogue devices that we use today are relic of past or part of industry business model.
With DSD we are in position to by pas all analogue processing except speaker driver.
So no speaker cables, no interconnecting cables, just file strait play on speaker driver.
Ok some digital handling is needed , last stage is your power DAC that i prefer to be fix on speaker driver itself.
My concept is with one cable - power cord direct to speaker with data transfer over same cable and all handling of signal is in speaker assembly.
Yes that data transfer over power lines exist last 40 years, and it is adopted in IT with PoE networking, so nothing new.
Only digital handling. Network stream whatever format - conversion in to PCM 32bit 384 /768Khz to make necessary equalization - splinting in to 3 or 4 bands LF-MF-HF-UHF (16-120Hz 120Hz- 2Khz 2Khz- .. al the way to cover 16Hz to 60Khz bandwidth).
Conversion of PCM splited chanels in to DSD256,
Play on each driver dedicated DSD and enjoy the sound.
Something similar to KII audio
No one today try to make exquisite steam locomotive for high speed railway, but in audio market people still want to use tubes, spend fortune on cables, stands, ..... in believing that A class mono block amplifier that need 2 person to move it is exquisite high end peace of audio gear, or 100K$ speakers that 2 persons can not move.
So who is interested
But I look for something more radical.
As we know music is recorded in digital formats files fro 1978 - https://musicproductionknowledge.com/software/digital-audio-workstation/daw-history and massively from 1980.
Therefore source of all music that we today listen is mainly from some file. That say all analogue devices that we use today are relic of past or part of industry business model.
With DSD we are in position to by pas all analogue processing except speaker driver.
So no speaker cables, no interconnecting cables, just file strait play on speaker driver.
Ok some digital handling is needed , last stage is your power DAC that i prefer to be fix on speaker driver itself.
My concept is with one cable - power cord direct to speaker with data transfer over same cable and all handling of signal is in speaker assembly.
Yes that data transfer over power lines exist last 40 years, and it is adopted in IT with PoE networking, so nothing new.
Only digital handling. Network stream whatever format - conversion in to PCM 32bit 384 /768Khz to make necessary equalization - splinting in to 3 or 4 bands LF-MF-HF-UHF (16-120Hz 120Hz- 2Khz 2Khz- .. al the way to cover 16Hz to 60Khz bandwidth).
Conversion of PCM splited chanels in to DSD256,
Play on each driver dedicated DSD and enjoy the sound.
Something similar to KII audio
No one today try to make exquisite steam locomotive for high speed railway, but in audio market people still want to use tubes, spend fortune on cables, stands, ..... in believing that A class mono block amplifier that need 2 person to move it is exquisite high end peace of audio gear, or 100K$ speakers that 2 persons can not move.
So who is interested
In case FB get developed than an remote sense as like in BatoMM can be done to correct speaker cable errors... geneary I not like sound of the opamps, or anything like AB, this small ddpd is for me the best sounding. Probably insufficient slew rate in most amplifiers is something that greatly affects the localization of instruments, but improves measurements, mask things, simply anything that has an opamp in it doesn't sound good enough to me. I don't know why but I have that impression. And I wouldn't like to argue about that, I simply think that's the way it is. I also have the same opinion about amplifier measurements, nothing means much to me until my ear confirms what is the best. My opinion.
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Yes this is nice, active ddpd speaker! Having power over usb pd and in the same time digital audio trought the same cable, is nice idea. That way amplifier would be inside speaker and each drier have their own amplifier, and by dsp make things easier to tune, that would be definitelly amazing. Having gan with slew rate > 150V/ns is allready something very special, it must sound nice. I thinked to replace gates inside H bridge with something small but didn't found something which can be easy implemented on this almost full blue litle alu enclosure, don't have free space, but I will think to replace it someday and add more power to ddpd mini, in v3 probably. An cm4 module and an lcd would be also one of the option with a bit bigger enclosue, something similar to what Shanling doing on their audio devices. I'm finishing a few more projects with analogy and I'm definitely not going to try that again, I'm completely turning towards this concept of direct digital.
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Half analog one, which is still not fully finished yet , putting that cm4 and display to our mini version, completely self-contained device, would be my goal for ddpd mini v3
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I have a problem with 50Hz on the FFT, I thought it was a ground loop problem because my Cosmos ADC does not have usb isolator so I made one with isousb211 but it didn't help, all is the same, so I don't know what the problem is, that's why I didn't finish the device. I have to disassemble Hypex modules, and try if problem comes from modules or from something else. I want to measure my device but something is not going right in measurement setup. Don't hear anything on speakers in relation to 50Hz. Moved torus transformer outside, nothing helped, strange. I live in a building with 21 apartments, we are all on the same ground, maybe that is the problem. I currently have no way to measure, and I have no solution to eliminate the problem with the measurement setup. : (
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A simple concept is not so simple to make properly, SAVIOLA look seriously good and expensive.
This PCB manufacturing is so expensive in small quantity and you provide all files for them.
It is cheaper to use modules from other makers , if functionally can be used.
In my analysis all required functional parts exist on market , need some little adjustments. Even there are GAN-fet modules.
Did not find Power DAC module that you make, perhaps even that exist , just not find by me. I know that BUCHARDT use them in active speakers , and they made all elements and assambly in China.
One most sensitive part for hardcore audiophiles is turntable cartridge pre amplifier and RIA curve adjustment.
But there is interesting product in that area that can be utilized - https://www.parksaudiollc.com/puffinsupport.html .
And it is not the only one, it start to popup more and more as this one - https://us.technics.com/products/stereo-integrated-amplifier-su-r1000?_pos=1&_fid=15b6db435&_ss=c This SU-R1000 actualy have DSD power DAC as ampifier and AD converter for phono input and DSP for RIA correction.
And this one exist more than 10y on a market - https://lyngdorf.steinwaylyngdorf.com/lyngdorf-tdai-1120/ Actualy vith SAVIOLA you are making Lyngdorf TDAI-1120 in DIY version. And TDAI-1120 is serius device as it is part of https://steinwaylyngdorf.com/
I still prefer how vinyl sound vs CD, perhaps because my cartridge on turntable have frequency bandwidth 18Hz - 50Khz little bit more over the double than CD standard. Many (myself incuded) convert their Vinyl in to PCM 24bit 96Khz or 192Khz, even in DSD files and that sound way better than CD with same music. I tested as I have Vinyl and CD for same albums (Sting, P. Gabriel, Yello, ..). So today Digital is prevailing in any way and aspect with today capability. Now it is time to remove analogue amplifier as it is not needed.
This PCB manufacturing is so expensive in small quantity and you provide all files for them.
It is cheaper to use modules from other makers , if functionally can be used.
In my analysis all required functional parts exist on market , need some little adjustments. Even there are GAN-fet modules.
Did not find Power DAC module that you make, perhaps even that exist , just not find by me. I know that BUCHARDT use them in active speakers , and they made all elements and assambly in China.
One most sensitive part for hardcore audiophiles is turntable cartridge pre amplifier and RIA curve adjustment.
But there is interesting product in that area that can be utilized - https://www.parksaudiollc.com/puffinsupport.html .
And it is not the only one, it start to popup more and more as this one - https://us.technics.com/products/stereo-integrated-amplifier-su-r1000?_pos=1&_fid=15b6db435&_ss=c This SU-R1000 actualy have DSD power DAC as ampifier and AD converter for phono input and DSP for RIA correction.
And this one exist more than 10y on a market - https://lyngdorf.steinwaylyngdorf.com/lyngdorf-tdai-1120/ Actualy vith SAVIOLA you are making Lyngdorf TDAI-1120 in DIY version. And TDAI-1120 is serius device as it is part of https://steinwaylyngdorf.com/
I still prefer how vinyl sound vs CD, perhaps because my cartridge on turntable have frequency bandwidth 18Hz - 50Khz little bit more over the double than CD standard. Many (myself incuded) convert their Vinyl in to PCM 24bit 96Khz or 192Khz, even in DSD files and that sound way better than CD with same music. I tested as I have Vinyl and CD for same albums (Sting, P. Gabriel, Yello, ..). So today Digital is prevailing in any way and aspect with today capability. Now it is time to remove analogue amplifier as it is not needed.
JlcPcb is the cheapest one, there is apsolutly no cheaper one on the world. Saviola ddpd mini v2 is expensive because it contain 109 unique elements multiplied with nuber of components per component, for example one device contain more than 500 components on pcb size 100x100mm, that cost a lot because almost all components is 0201 and feed machine is the most expensive since $1.xx cost per component when it goes to the feed machine for soldering, thats expensive. For example if my components is bigger than 0201 than I have no problem to solder them myself, that save money a lot but since our components is 0201 and I no want to mess with it, its not easy to solder myself so I decided to pay for soldering service, even its not that expensive because 500+ components is on the pcb! Saviola biger one, half analog have all self-contained things like android device, 4.3" lcd, optic inputs, usb input, i2s in-out, bluetooth, android, ..etc, complete mini PC like based audio device including 2x180Wats Hypex ucd180 modules, dsc2 diferential discrete dsd dac, analog preamplifier with i/v, tone control with relay based pots digitaly controled... etc. But saviola ddpd mini v2 is fully digital, no preamplifier inside, no dac, no opamps...etc, the only thing which is missing is android device and their display, maybe in v3 I will include booth. In bigger ddpd it will contain everything as like in saviola analog version! The interesting thing is cm4 module, you can install whatever you want on it, linux, android, windows, or some distro like Kodi, Daphile...etc and everything is reclocked with asynchrone sample rate converter, in my case to 48k fixed, so only one clock and fanout bufer is need for 12.288MHz clk : )
See how many components is inside mini v2
See how many components is inside mini v2
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